“Ninja Assassin,” starring Korean pop star Rain, swoops into theaters this weekend and in addition to slicing up the baddies, the movie should do a serious number on all of our post-Thanksgiving bellies.

To get ready for playing the world’s most dangerous killer, Rain embarked upon a ninja-worthy fitness regimen that left him more shredded than the mozzarella cheese I like to melt on my mashed potatoes.

So come Friday morning if you find yourself needing motivation to get back to the gym, just hit play on the clip below (via).